Study Design and Population This randomized controlled trial will be conducted in the ED of an academic tertiary care hospital (annual census 60,000). Consecutive, adult (18-64 years) patients presenting to the ED with a MTBI sustained within the preceding 48 hours will be eligible for enrollment. Acute MTBI will be defined by the Zurich consensus statement as a direct blow to the head, face, neck or elsewhere on the body with a force transmitted to the head which may or may not involve loss of consciousness AND results in brain injury with 1 or more symptoms in 1 or more of the following clinical domains: somatic, cognitive, emotional or behavioral, or sleep.